As you can see the disk quota is -1 meaning infinite amount of space. When the client logs into ispconfig control panel and looks at the web site he sees -1 as his disk quota. When he click on any of the tabs to get to redirect, ssl, or options it give the error

ERROR

Harddisk quota is 0 or empty.

Click to expand...

And then changes the qouta to 0.

The user can also use FTP to add files to his website, so I am unsure as to why this error is occurring.